Olivia Munn had an “unbelievably difficult” time with postpartum anxiety. The 44-year-old actress welcomed son Malcolm in November 2021 with her husband John Mulaney and in the months that followed the birth, she suffered nightly bouts of anxiety which she likened to being stuck underwater and unable to come up for air. Speaking on ‘The Kelly Clarkson Show’, she said: “I had heard about postpartum depression and I was prepared for it, but postpartum anxiety was something I had never heard about and it hit me like the entire ocean was on top of me. “It was unbelievably difficult. It was a month…